BOSTON (CBS) – More than 4,000 runners elected not to run the Boston Marathon Monday, while several others dropped out during the race as temperatures soared into the 80’s.

Related: Boston Marathon Guide

READ MORE: Rain Returns, Heavy Tuesday With Threat Of Flooding And Damaging Winds

Chief among the dropouts was defending men’s champion Geoffrey Mutai of Kenya. A golf cart was sent to pick him up with EMT’s near the 18-mile mark. The 30-year-old was on pace to finish at 2:12:52.

Defending women’s champion Caroline Kilel also did not finish the race.

Check: Top Finishers

A male runner collapsed near Coolidge Corner.

As of 1 p.m., the race’s medical director told WBZ-TV 185 runners had quit the race, most due to to heat exhaustion.

Boston emergency officials said 75 runners were transported to area hospitals. Approximately 2,200 runners needed treatment from medical tents, compared to 1,200 last year.

In all, six of the 17 elite women’s runners did not finish, while four of the 20 elite men’s runners did not finish.

READ MORE: Coronavirus In Massachusetts: Today's Developments

Read: Korir Wins Men’s Race | Cherop Wins Women’s Race | Cassidy, Reilly Win Wheelchair Races

Specifically, Agnes Kiprop of Kenya, one of the women’s elite runners, dropped out right before Mile 14.

Kibrom Temelso of Ethiopia went down just past 15K mark, according to police. The 37-year-old was running at a 3:11:27 pace.

Natick Police said American Dani Steinbacher went down around the 15K mark with difficulty breathing. She was running at a 3-hour pace.

WBZ NewsRadio 1030’s Doug Cope Reports On The Top American Finishers

WBZ NewsRadio 1030’s Doug Cope Has More On The Heat

American Dan Reed dropped out of the race a short time later for an unknown issue. He was taken to a medical area, according to Natick police.

MORE NEWS: Bob Neumeier, Longtime Sportscaster In Boston And At WBZ-TV, Dies At 70

In all, the race had 26,716 entrants and 22,426 starters, meaning 4,290 elected not to run. The Boston Athletic Association offered a deferment option due to the high temperatures, though it’s unknown exactly how many runners chose to run in 2013 instead.